Proteasome Plasticity

FEBS Lett. 2005 Jun 13;579(15):3214-23. doi: 10.1016/j.febslet.2005.04.048.

Abstract

The 26S proteasome is responsible for regulated proteolysis of most intracellular proteins yet the focus of intense regulatory action itself. Proteasome abundance is responsive to cell needs or stress conditions, and dynamically localized to concentrations of substrates. Proteasomes are continually assembled and disassembled, and their subunits subject to a variety of posttranslational modifications. Furthermore, as robust and multi-tasking as this complex is, it does not function alone. A spattering of closely associating proteins enhances complex stability, fine-tunes activity, assists in substrate-binding, recycling of ubiquitin, and more. HEAT repeat caps activate proteasomes, yet share remarkable features with nuclear importins. Fascinating cross talk even occurs with ribosomes through common maturation factors. The dynamics of proteasome configurations and how they relate to diverse activities is the topic of this review.

Publication types

  • Research Support, Non-U.S. Gov't
  • Review

MeSH terms

  • Animals
  • Humans
  • Proteasome Endopeptidase Complex / chemistry*
  • Proteasome Endopeptidase Complex / genetics
  • Proteasome Endopeptidase Complex / metabolism*
  • Protein Binding
  • Protein Transport
  • Ribosomes / metabolism

Substances

  • Proteasome Endopeptidase Complex